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jackedup6.0
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Discussion Starter #1
i dnt realy have the accsess to high quality oil so here are my choices 10w40 valvoline premium or 15w40 motorcraft diesel oil.which one is bter for 03 6.0
 

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The 10w 40 is not Diesel rated (CJ etc) Go with the Motorcraft. But if they were both diesel rated the 10w 40 would actually be better. It will flow better for starts and cooler weather yet still have the same film viscosity when up to temp. It will ave a bit more VI additive which is what shears but its very minimal.

Go with the Motorcraft of the two.
 
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